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AMICUS05.ADF
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serial
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1986-01-15
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Serial Interface Connector Specification
--------------------------------------------------
The 25 pin D type connector with sockets (DB25S=female) is used to
interface to RS232C standard signals. Signal names correspond to
those used in the appendices of the hardware manual when possible.
WARNING: Pins 14, 21 and 23 carry power. Do not connect to
these pins inadvertantly as they can permanently damage
external equipment. Also, pins 15-18, 23-25 carry
non-standard signals and should not be inadvertantly
connected. NEVER use a fully wired 25 line cable!
Serial Interface Connector Pin Assignment (J6)
--------------------------------------------------
RS232
pin name dir std notes
1 FGND y frame ground -- do not tie to logic ground
2 TXD O y transmit data
3 RXD I y receive data
4 RTS O y request to send
5 CTS I y clear to send
6 DSR I y data set ready
7 GND y signal ground -- do not tie to frame ground
8 CD I y carrier detect
9 --- n
10 --- n
11 --- y
12 --- n
13 --- n
14 -5V n* 50 ma maximum *** WARNING -5V ***
15 AUDO O n* audio output from left (channels 0, 3) port,
intended to send audio to the modem
16 AUDI I n* audio input to right (channels 1, 2) port,
intended to receive audio from the modem;
this input is mixed with the analog output
of the right (channels 1, 2). It is not
digitized or used by the computer in any
way.
17 EB O n* 716 KHz clock that supports 68000 peripheral
transfers, intended for modem interface;
this is the buffered version of the E
clock from the 68000.
18 INT2* I n* asserting this OPEN COLLECTOR signal will
generate a level 2 interrupt to the 68000
if it is enabled.
19 --- n
20 DTR O y data terminal ready
21 +5V n* 100 ma maximum *** WARNING +5V ***
22 --- n
23 +12V n* 50 ma maximum *** WARNING +12V ***
24 C2* O n* 3.58 MHz intended for modems that need a
colorburst clock.
25 RESB* O n* Amiga system reset
n*: See warning above
Serial Interface Connector Timing
--------------------------------------------------
Maximum operating frequency is 19.2 KHz. Refer to EIA standard
RS232C for operating and installation specifications. A rate of
31.25 KHz will be supported through the use of a MIDI adapter.
Modem control signals (CTS, RTS, DTR, DSR, CD) are completely under
software control. The modem control lines have no hardware affect
on and are completely asynchronous to TXD and RXD.
Serial Interface Connector Electrical Characteristics
-------------------------------------------------------
Outputs min typ max
Vo(-): -2.5 -x- -5.5 V Negative output voltage range
Vo(+): 8 -x- 13.2 V Positive output voltage range
Io: -x- 10 ma Output current
Inputs min typ max
Vi(+): 3 -x- 25 V Positive input voltage range
Vi(-): -25 -x- .5 V Negative input voltage range
Vhys: -x- 1 -x- V Input hysteresis voltage
Ii: .3 -x- 10 ma Input current
Unconnected inputs are interpreted the same as positive input
voltages.